<template>
  <div>
    <!-- 头部部分 -->
    <header class="header">
      <h1>todos</h1>
      <input class="new-todo"
             placeholder="请输入任务名称"
             autofocus
             v-model.trim="newName"
             @keyup.enter="newList" />
    </header>
  </div>
</template>

<script>
export default {
  data(){
    return{
      newName:''
    }
  },
  methods:{
    newList(){
      if (!this.newName) {
        alert('不能为空')
      }
     this.$emit('newList',this.newName)
     this.newName=''
    }
  }
}
</script>

<style scoped>
</style>